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spi: stm32-ospi: Increase read throughput in indirect mode

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Schedule() is called every u8/u16 or u32 read accesses which is overkill.
Move schedule() from stm32_ospi_read_fifo() to stm32_ospi_tx_poll()
and call schedule() only every 1MB chunk of data.

Test performed by reading 64MB on sNOR on stm32mp257f-ev1 board:

          before      after    ratio
Read  :  10.6MB/s    14.2MB/s   +34%

Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
This commit is contained in:
Patrice Chotard
2025-12-16 16:31:52 +01:00
parent 6a1bdb7e95
commit 9e8bc1c6be
1 changed files with 3 additions and 1 deletions
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4
drivers/spi/stm32_ospi.c
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@@ -142,7 +142,6 @@ static void stm32_ospi_read_fifo(void *val, phys_addr_t addr, u8 len)
case sizeof(u8):
*((u8 *)val) = readb_relaxed(addr);
};
schedule();
}
static void stm32_ospi_write_fifo(void *val, phys_addr_t addr, u8 len)
@@ -200,6 +199,9 @@ int stm32_ospi_tx_poll(struct udevice *dev, void *buf, u32 len, bool read)
fifo(buf, regs_base + OSPI_DR, step);
len -= step;
buf += step;
if (!(len % SZ_1M))
schedule();
}
return 0;